1. Department of Digestive Surgery, Strasbourg University Hospital, Strasbourg, France
2. Pôle de Santé Publique - Santé au Travail - Groupe Methode en Recherche Clinique CHRU Strasbourg, Strasbourg, France
3. Department of Digestive Surgery, Besançon University Hospital (Jean Minjoz), Besançon, France
4. Department of Digestive Surgery, Dijon University Hospital, Dijon, France
5. Department of Digestive Surgery, Reims University Hospital, Reims, France